Armature bearing for railway locomotives



N. D. LEVIN.

A'RMATURE BEARING FOR RAILWAY LOCOMOTIVES.

APPLICATION FILED NOV. 21. 1916.

1,404,306. Patented Jan. 24, 1922.

a qw 6 i 28 H II 27 A ,2. WITNESSES; 05W N.TOR

UNITED STATES PATENT OFFICE.

NILS D. LEVIN, F COLUMBUS, OHIO, ASSIGNOR TO THE JEFFREY MANUFACTURING COMPANY, 01 COLUMBUS, OHIO, A CORPORATION OF OHIO;

ARMATURE BEARING FOR RAILWAY LOCOMOTIVES.

Specification of Letters Patent. Patented Jan, 24, 1922,

Application filed November 21, 1916. Serial No. 132,685.

, To all whom it may concern:

ful Im Jrovements in Armature Bearin s for Railway Locomotives, of which the following is a specificatlon, reference being had therein to the accompanying drawing.

The present invention relates to certain new and useful improvements in electric railway locomotives and particularly to locomotives of the class in which each has one or more motors, each of which is supported upon the axle of a locomotive and is positioned between the inner faces of the driving track wheels.

. In each of the locomotives of the class to which this invention relates the armature shaft is subject to excessive longitudinal thrusts due to the surgings of the locomotive because of irregularities in the track. This is especially true where the locomotives pass around curves of short radii such as are frequently found in mines. The space between the inner faces of the driving wheels is very limited, yet the motors must be expanded both axially and vertically, in order to provide sufficient motor metal to furnish power for the work to be done. The space referred to for the motor when the latter is properly constructed for power is too small to admit of the use of ball or roller thrust bearings, and permit-the frequent access to the bearing chambers. I

The object of the invention is to provide, in a locomotive of the class described, a motor having thrust bearings and holding devices of. a novel construction which are capable of withstanding the excessive strains of the railway service and which can be placed in the aforesaid limited space between the driving wheels and permit wcess to the bearings whenever required.

The devices by which I attain this object are fully set forth in the following specification and illustrated in the accompanying drawing of which:

Fig. 1 is a longitudinal section taken along the vertical central plane of an electric m0- tor equipped with the devices of my invention.

Fig. 2 is an end elevation of the motor illustrated in Fig. 1. Mounted upon the axle of a locomotive one of the driving wheels bein broken away to reveal the motor.

. 4 ig. 3 is a plan view showing the relation of the motor to the wheels and axles.

Like numerals refer to similar parts in. the several figures.

In the drawing numeral 1 indicates the field frame and 2 the armature of a railway electric motor. The field frame is provided with magnetic poles 3 and field coils 4 in the manner common to such motors. The armature 2 is of the usual construction and is attached to and supported by the armature shaft 5. Fitted in the ends of the field frame 1 are end bearing castings 6 and 7 having re: cesses 8 and 9 to support the roller bearings 10 and 11 in which the armature shaft 5 is mounted. Formed on the end bearings casting are inwardly extending flanges 12 which closely approach the shaft 5 and in these flanges are formed annular grooves into which are fitted felt washers 13 which close the space between the shaft 5 and flanges 12 to exclude oil and dust from the interior of the motor. For convenience of assembly and inspection the field frame 1 is divided along a diagonal transverse plane, the two parts being provided with abutting flanges 14 and 15 clamped together by suitable bolts 16. Formed on the lower half 17 of the field frame 1 are journal bearings 18 adapted to bear upon the axle 19 of the locomotive to support the weight of the motor. To the axle 19 is attached the driving wheels 20.

adapted to support the locomotive upon the track rails 21. The armature shaft 5 is extended beyond the bearing 10 and to this shaft extension is attached a spur pinion 22 which engages with the spur gear 23 attached to the axle 19 to rotate the driving wheels 20 to propel the locomotive. Formed on the lower half 17 of the motor frame 1 is a lug 24; which engages the abutment 25 of the frame of the locomotive to prevent the rotation of the motor about the axle 19. Screw threaded into the end bearing casting 7 at the end of the motor opposite the armature pinion is a closure plate 26 by which the bearing recess 9 is closed against the admission of dust to the bearing 11 or the escape of lubricant therefrom. Secured to the gear end bearing 6 by suitable machine screws 27 is a stirrup member 28 abutting upon the gear case sections andj'37'set in the ends of the armature shaft 29 and 30 to whichit is attached by suitable 7 machine screws 31, the three parts thus united forminga gear case which completely surrounds and protects the gears 22 and 23. 1 The gear case section 29 is further supported 7 by alug 32 of the'motor frame l to which it is attached by the machine screw 33. 7

- In locomotives adapted to use on the narrow gauge track of coal mines and the like the space between the driving-wheel 20 is so small that great difiiculty has been experienced in designing motor of suitable capacity within the allowable dimension. By the use of rollerbearings arranged to extend into recessesof the ends of the armature'the rajdial thrust of the armature have been very satisfactorily provided for." Such bearings, however,'make no'provisio'ns for the longitudinal thrust of the armature which, under conditions encountered in locomotive service,

are very considerable. Tomeet these condi tions I have provided recesses in the cover plate26and stirrup member 28 in which are inserted steelplates 34 and 35 adapted toengage witlrthe end of hardened steel pins 36 5, thereby-limiting the longitudinal move ment of the alm r The end walls 6 and 7 of'themotor; are

positioned so close to the inner faces of the driving wheels that it isimpossible to fasten in place bearings ofthe ordinary sorts. They require the use of bolts which are moved longitudinally axially of the motor when they arebeing inserted or. withdrawn. If

they are long enough to be effective in hold- I ing in place the separableparts, they can notbeengaged by tools'and drawn entirely outward; 1 I

With the devices shown it is merely necessary to loosen the closure plate '26 which Y is threaded on its periphery andsecured by the threads in the large aperturein the'end wall. closure cap can be turned sufficiently to remove ittopermit access to the'bearing chamberf- -After a new wearing plate or new V ithrust pinfhas'been 'inserted, the closure 'capcan'be as'readily replaced; iThis-element therefore, although occupying but little space, axially, serves the several purposes of v a lubricant holder, a retainer for theballf bearings,.an abutment device for the heavy By a simple spanner wrench this thrusts of the armature, and a holder for 'the hardened thrust-taking elements which receive the thrust of thearmature shaft, 7

By the arrangements: of parts above described, I have provided adequate means for armature of a railway electric motor such as may be placed in the limited space available between the driving wheels of the locomoti es and which may be readily renewed when worn or otherwise injured.

, The outer surface of the disc plate 7 and closure 26, that is of the end part of the motor adjacent the track wheel is ap-' is lifted and the armature is slightly elevated,

permitting cleaning and repairing whenever part ofkthe motor can be brought close to limiting the longitudinal movement of the necessary without separating the minor parts 7 from each other. 7

What I clalm is f 5 V V In an electric locomotive having a driving axle, track wheels rigidlyattached thereto, an electric motor hinged to the aXlewith its end plates closeto the inner faces of the track wheels, the combination with the field magnet'the detachable end-plate 7 closing thechamber in the field and separable therefrom and formed with the t inwardly extending internalbearing support 12, and

with a relatively'large aperture having a roller bearings threaded edge; and the mounted in the said detachable end plate', of V the fiatim-perforate closure plate detachably secured iinthe threaded aperture and pro- 5 I vided' with a removable bearing plate, the armature axle having "its journal part mounted in the'rolleribearing and provided with a detachable thrust pin "36 arrangedto bear against the said wearing plate in' a v -In testimony whereof I aflix my' signa-j" the threaded 1 cap,

ture, in the presence of two'witnesses. 7 V NILS D; 'LEVIN.

YVit'nesses: r r c DUDLEY T. IsHER, I

HARRY DEAN. 

